Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Sounds like youv'e got a small improvement.As an overview of this particular era it's probably fair to say that this is the start of running bike engines leaner to make them less poluting (particularly in USA) so where as previous models displayed more tolerance to precise jetting, ther is less room for margin on this model.If it misses as you start to open the throttle it could be related to the accelerator pump (this sprays additional fuel into the carbs ONLY AS YOU TURN the twist grip) this is to overcome the weak running of the normal setup. It's a transition stage to make it accelerate cleanly without stuttering and if not working correctly would show as a slow or missfire response if not delivering enough fuel during that increased damand.
If you want to look at the Dyna S system, go to www.z1enterprises.com They're a good price and the exchange rate is good too.Jeff Saunders (the proprietor) is a member on sohc4.net and is a very knowledable and helpful chap.